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25×25の計算方法
25x252x3=65x5=2562535x353x4=125x5=25122545x454x5=205x5-252025105x10510x11=1101102524x264+6=10の場合2x3=64x6=24624202121=3x720=4x52021=43x47…
新因数分解
x2+px+q=0① pを2で割る。② ①を2乗してqを引く。③ ②のルートを①に足し引きする。…